30166512211021 has 4 divisors (see below), whose sum is σ = 30202901249500. Its totient is φ = 30130123172544.

The previous prime is 30166512210997. The next prime is 30166512211091. The reversal of 30166512211021 is 12011221566103.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5961342195396 + 24205170015625 = 2441586^2 + 4919875^2 .

It is a cyclic number.

It is not a de Polignac number, because 30166512211021 - 2³¹ = 30164364727373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30166512211091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18194517996 + ... + 18194519653.

It is an arithmetic number, because the mean of its divisors is an integer number (7550725312375).

Almost surely, 2^{30166512211021} is an apocalyptic number.

It is an amenable number.

30166512211021 is a deficient number, since it is larger than the sum of its proper divisors (36389038479).

30166512211021 is an equidigital number, since it uses as much as digits as its factorization.

30166512211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36389038478.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 30166512211021 its reverse (12011221566103), we get a palindrome (42177733777124).

The spelling of 30166512211021 in words is "thirty trillion, one hundred sixty-six billion, five hundred twelve million, two hundred eleven thousand, twenty-one".